EP3251770A1 - Article moulé par compression, et procédé et ligne d'équipement pour fabrication d'article moulé par compression - Google Patents

Article moulé par compression, et procédé et ligne d'équipement pour fabrication d'article moulé par compression Download PDF

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Publication number
EP3251770A1
EP3251770A1 EP16742962.0A EP16742962A EP3251770A1 EP 3251770 A1 EP3251770 A1 EP 3251770A1 EP 16742962 A EP16742962 A EP 16742962A EP 3251770 A1 EP3251770 A1 EP 3251770A1
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EP
European Patent Office
Prior art keywords
press
formed product
bend section
bending radius
interior angle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16742962.0A
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German (de)
English (en)
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EP3251770A4 (fr
EP3251770B1 (fr
Inventor
Kenichiro Otsuka
Yoshiaki Nakazawa
Ryuichi Nishimura
Masahiro Saito
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Nippon Steel Corp
Original Assignee
Nippon Steel and Sumitomo Metal Corp
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Publication date
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Publication of EP3251770A1 publication Critical patent/EP3251770A1/fr
Publication of EP3251770A4 publication Critical patent/EP3251770A4/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/005—Multi-stage presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards

Definitions

  • the present invention relates to a press-formed product for use in automobiles, in various vehicles other than automobiles, in general machinery, and in ships and vessels and the like, and more particularly relates to a press-formed product having a bend section, as well as a method and an equipment line for producing the press-formed product.
  • Press-formed products having a bend section are used, for example, in frame members of an automobile body (for example: cross members, side members, side sills, pillars and the like), and are used in various components of an automobile (for example: door impact beams, toe-control links, suspension arms and the like).
  • the aforementioned press-formed products are obtained by bending a steel plate as a starting material using a press.
  • press-formed products are being increasingly made with thinner walls using high strength steel plates.
  • FIG. 1A and FIG. 1B are cross-sectional diagrams that illustrate an overview of a conventional common bending method.
  • FIG. 1A illustrates a situation when performing bending
  • FIG. 1B illustrates a press-formed product 2 that is produced after undergoing the bending illustrated in FIG. 1A .
  • a bend section 5 in the press-formed product 2 is formed by press working in a single step. Specifically, as shown in FIG. 1A , a steel plate 1 is bent using a punch 3 and a die 4. By this means, as shown in FIG. 1B , the press-formed product 2 having the bend section 5 is formed.
  • the bendability of the steel plate 1 is evaluated based on a limit R/t.
  • R represents a minimum bending radius with which bending can be performed without the occurrence of cracking
  • t represents the thickness of the steel plate 1.
  • high strength steel plates having a tensile strength of 980 MPa or more and a small degree of elongation have begun to be used as the starting material for the aforementioned frame members. Further, high strength steel plates having a tensile strength of 590 MPa or more are being used as the starting material for suspension components (for example, suspension arms). In short, as the strength of the steel plate 1 increases, there is a tendency for the limit R/t to also increase.
  • the steel plate 1 will crack.
  • the bending radius of the bend section 5 of the press-formed product 2 is designed to be a large radius, the rigidity of the frame member or suspension component will decrease and the impact energy absorption performance thereof will decline. Accordingly, there is a strong need for a processing method that can decrease the limit R/t when producing the press-formed product 2 having the bend section 5 from a high strength steel plate.
  • FIG. 2A to FIG. 2C are cross-sectional diagrams illustrating an overview of a bending method disclosed in Japanese Patent Application Publication No. 2010-172912 (Patent Literature 1).
  • FIG. 2A illustrates a situation when performing processing in a first step
  • FIG. 2B illustrates a situation when performing processing in a second step
  • FIG. 2C illustrates a press-formed product 7 that is produced as a result of undergoing the bending illustrated in FIG. 2A and FIG. 2B .
  • a bend section 8 of the press-formed product 7 formed by press working that is divided into two steps. Specifically, as shown in FIG. 2A , in the press working in the first step, a steel plate 6 is bent using a punch 9 and a die 10. The punch 9 and the die 10 impart a shape having a bending radius R 1 that is larger than a bending radius R 2 of the bend section 8 of the press-formed product 7 to the steel plate 6. By this means, as shown in FIG. 2B , an intermediate formed product 12 having a bend section 11 with a bending radius R 1 is formed.
  • the intermediate formed product 12 is subjected to processing using a punch 13 and a die 14.
  • the punch 13 and the die 14 impart a shape having the bending radius R 2 of the bend section 8 of the press-formed product 7 to the intermediate formed product 12.
  • the press-formed product 7 illustrated in FIG. 2C is formed.
  • a front end angle ⁇ 2 of the punch 13 used in the second step is the same as a front end angle ⁇ 1 of the punch 9 used in the first step.
  • the interior angle of the bend section 8 of the press-formed product 7 is the same as the interior angle of the bend section 11 of the intermediate formed product 12.
  • Patent Literature 1 Japanese Patent Application Publication No. 2010-172912
  • Patent Literature 1 discloses that the limit R/t can be made 0 when producing a press-formed product having a bend section using a stainless steel plate that has high tensile strength of 889 MPa and in which the elongation is a high value of 59%.
  • a metal plate having high tensile strength and a small degree of elongation such as in a high strength steel plate, there is a risk that cracking will occur at the bend section. Accordingly, there is a need to enable reliable lowering of the limit R/t.
  • One objective of the present invention is to provide a press-formed product in which tensile strain in an outer surface of the bend section is small and cracking is suppressed, even though the product has a bend section with a small bending radius and a tensile strength of 590 MPa or more.
  • Another objective of the present invention is to provide a production method and a production equipment line that can produce the aforementioned press-formed product.
  • a press-formed product according to one embodiment of the present invention is made from a metal plate having a tensile strength of 590 MPa or more, and includes a pair of flat sections and a bend section connecting the pair of flat sections.
  • a plate thickness increases as a distance from a vicinity of a top part of the bend section increases, the plate thickness decreases as a distance from a vicinity of an end of the bend section increases, and thereafter the plate thickness increases again, and beyond a position separated by a distance corresponding to 1.5 times an original plate thickness from a position of an end of the bend section, the plate thickness becomes the original plate thickness.
  • a ratio "t 2 /1 1 " between an average value t 2 of a plate thickness in an area from the position of the end of the bend section to the position separated therefrom by the distance corresponding to 1.5 times the original plate thickness, and a plate thickness 1 1 at the top part of the bend section is preferably less than 1.01.
  • the aforementioned press-formed product includes a top plate part, two vertical wall parts, and a ridge line part connecting the top plate part and the respective vertical wall parts, preferably the top plate part and the vertical wall part constitute the flat section, and the ridge line part constitutes the bend section.
  • the aforementioned press-formed product includes a top plate part, two vertical wall parts, an upper-side ridge line part connecting the top plate part and the respective vertical wall parts, two flange parts, and a lower-side ridge line part connecting the respective vertical wall parts and the respective flange parts
  • the top plate part and the vertical wall part constitute the flat section
  • the upper-side ridge line part constitutes the bend section
  • the vertical wall part and the flange part constitute the flat section
  • the lower-side ridge line part constitutes the bend section.
  • the aforementioned press-formed product is made from a steel plate having a tensile strength or 1180 MPa or more.
  • the tensile strength may be 780 MPa or more, or may be 980 MPa or more.
  • a production method for producing a press-formed product is a method for producing a press-formed product including a pair of flat sections, and a bend section connecting the pair of flat sections, and in which a bending radius of the bend section is represented by R 2 and an interior angle formed by the pair of flat sections is represented by ⁇ 2 .
  • the production method includes a starting material preparation step, a first forming step and a second forming step. In the starting material preparation step, a metal plate having a tensile strength or 590 MPa or more is prepared.
  • the metal plate is subjected to press working using a die assembly to form an intermediate formed product having a bend section with a bending radius of R 1 (mm) and an interior angle of ⁇ 1 (°) at a portion corresponding to the bend section of the press-formed product.
  • the intermediate formed product is subjected to press working using a die assembly to form the press-formed product having a bend section with a bending radius of R 2 (mm) and an interior angle of ⁇ 2 (°) at a portion of the bend section of the intermediate formed product.
  • the bending radius R 1 and the interior angle ⁇ 1 of the intermediate formed product and the bending radius R 2 and the interior angle ⁇ 2 of the press-formed product satisfy conditions of Formulae (1) to (3) hereunder. 1.05 ⁇ A 1 / A 2 1.0 ⁇ R 1 / R 2 A 1 / A 2 ⁇ 6.0 / R 1 / R 2
  • a 1 (°) is a supplementary angle of the interior angle ⁇ 1 of the intermediate formed product, which is represented by Formula (A) hereunder
  • a 2 (°) is a supplementary angle of the interior angle ⁇ 2 of the press-formed product, which is represented by Formula (B) hereunder.
  • a 1 180 ⁇ ⁇ 1
  • a 2 180 ⁇ ⁇ 2
  • the bending radius R 1 and the interior angle ⁇ 1 of the intermediate formed product and the bending radius R 2 and the interior angle ⁇ 2 of the press-formed product satisfy conditions of Formulae (1), (4) and (5) hereunder. 1.05 ⁇ A 1 / A 2 1.5 ⁇ R 1 / R 2 A 1 / A 2 ⁇ 3.5 / R 1 / R 2
  • a punch and a die are used as the die assembly in the first forming step, and a punch and a die are used as the die assembly in the second forming step.
  • the intermediate formed product is restrained and positioned by a die pad provided in the die and an inner pad provided in the punch.
  • a production equipment line for producing a press-formed product is an equipment line for producing a press-formed product including a pair of flat sections, and a bend section connecting the pair of flat sections, and in which a bending radius of the bend section is represented by R 2 and an interior angle formed by the pair of flat sections is represented by ⁇ 2 .
  • the production equipment line includes a first press apparatus and a second press apparatus.
  • the first press apparatus includes a punch and a die for forming an intermediate formed product having a bend section with a bending radius of R 1 (mm) and an interior angle of ⁇ 1 (°) at a portion corresponding to the bend section of the press-formed product.
  • the second press apparatus includes a punch and a die for forming the press-formed product having a bend section with a bending radius of R 2 (mm) and an interior angle of ⁇ 2 (°) at a portion of the bend section of the intermediate formed product.
  • the bending radius R 1 and the interior angle ⁇ 1 of the intermediate formed product and the bending radius R 2 and the interior angle ⁇ 2 of the press-formed product satisfy the conditions of the aforementioned Formulae (1) to (3).
  • the bending radius R 1 and the interior angle ⁇ 1 of the intermediate formed product and the bending radius R 2 and the interior angle ⁇ 2 of the press-formed product satisfy the conditions of the aforementioned Formulae (1), (4) and (5).
  • the second press apparatus further includes a die pad provided in the die and an inner pad provided in the punch, and when performing press working, the intermediate formed product is restrained and positioned by the die pad and the inner pad.
  • the press-formed product of the present invention has a bend section with a small bending radius and has a tensile strength of 590 MPa or more, and tensile strain in an outer surface of the bend section of the press-formed product is small and cracking is suppressed.
  • the production method and the production equipment line of the present invention can produce such a press-formed product.
  • the present inventors conducted repeated intensive studies to solve the above described problem, and as a result obtained the findings described in (a) to (c) hereunder.
  • a perimeter ratio "L 1 /L 2 " between a perimeter L 1 (mm) of the bend section formed in the first step and a perimeter L 2 (mm) of the bend section formed in the second step is a factor involved in determining the size of the surface layer strain that occurs in the bend section.
  • the perimeters L 1 and L 2 of the bend section are lengths in the circumferential direction at a cross section of the bend section, and are represented by the following Formulae (i) and (ii).
  • L 1 ⁇ ⁇ R 1 ⁇ 180 ⁇ ⁇ 1 / 180
  • L 2 ⁇ ⁇ R 2 ⁇ 180 ⁇ ⁇ 2 / 180
  • the supplementary angle (that is, the exterior angle) A 1 (°) of the interior angle ⁇ 1 at the bend section that is formed in the first step is represented by the following Formula (A).
  • the supplementary angle (that is, the exterior angle) A 2 (°) of the interior angle ⁇ 2 at the bend section that is formed in the second step is represented by the following Formula (B).
  • a 1 180 ⁇ ⁇ 1
  • a 2 180 ⁇ ⁇ 2
  • the bending radius R 1 and interior angle ⁇ 1 (exterior angle A 1 ) of the bend section of the intermediate formed product that is formed in the first step and the bending radius R 2 and interior angle ⁇ 2 (exterior angle A 2 ) of the bend section of the press-formed product that is formed in the second step are mutually involved in determining the size of surface layer strain that arises in the bend section.
  • the aforementioned bending radius R 1 and interior angle ⁇ 1 (exterior angle A 1 ) and the aforementioned bending radius R 2 and interior angle ⁇ 2 (exterior angle A 2 ) satisfy the conditions of the following Formulae (1), (4) and (5). 1.05 ⁇ A 1 / A 2 1.0 ⁇ R 1 / R 2 A 1 / A 2 ⁇ 6.0 / R 1 / R 2 1.5 ⁇ R 1 / R 2 A 1 / A 2 ⁇ 3.5 / R 1 / R 2
  • the above Formula (1) means that the exterior angle A 1 of the bend section formed in the first step is larger than the exterior angle A 2 of the bend section formed in the second step.
  • the above Formula (1) means that, based on the above Formulae (A) and (B), the interior angle ⁇ 1 of the bend section formed in the first step is smaller than the interior angle ⁇ 2 of the bend section formed in the second step.
  • the sizes of the respective interior angles ⁇ 1 and ⁇ 2 are set in accordance with the design dimensions of the press-formed product. In practice, the sizes of the respective interior angles ⁇ 1 and ⁇ 2 are set within a range of 90° to 120°.
  • the above Formulae (2) and (4) mean that the bending radius R 1 of the bend section formed in the first step is larger than the bending radius R 2 of the bend section formed in the second step.
  • the sizes of the respective bending radii R 1 and R 2 are set in accordance with the design dimensions of the press-formed product. Specifically, the bending radii R 1 and R 2 are set as follows.
  • a value of R/t for which there is a risk of cracking occurring at the bend section is from 0.5 to 3.0.
  • R represents the bending radius at the time of bending
  • t represents the plate thickness of the metal plate on which the bending is executed.
  • an average plate thickness of a flat section of a press-formed product that is, the plate thickness of the metal plate that is the starting material is approximately 0.5 to 3.2 mm in the case of a sheet.
  • the plate thickness is approximately 3.2 to 30 mm, and is more than 30 mm in some cases.
  • cases in which there is a risk of cracking occurring at a bend section are taken as the object of the embodiment.
  • the bending radius R of the bend section of the press-formed product that is, the bending radius R 2 of the bend section formed in the second step
  • the bending radius R 1 of the bend section that is formed in the first step is approximately 0.26 to 8.2 mm, and preferably is approximately 0.38 to 5.2 mm.
  • the aforementioned bending radius R 2 is approximately 0.5 to 3.0 mm.
  • the aforementioned bending radius R 1 is approximately 0.55 to 16.0 mm, and preferably is approximately 0.8 to 10.0 mm.
  • the aforementioned bending radius R 2 is approximately 1.5 to 9.0 mm.
  • the aforementioned bending radius R 1 is approximately 1.6 to 49.0 mm, and preferably is approximately 2.3 to 31.0 mm.
  • the aforementioned bending radius R 2 is approximately 15 to 90 mm.
  • the aforementioned bending radius R 1 is approximately 16 to 494 mm, and preferably is approximately 23 to 314 mm.
  • the bending radius R 2 of the bend section of the press-formed product is defined within a range of R/t at which there is a risk of cracking occurring at the bend section, in accordance with the plate thickness t of the metal plate.
  • the range of R/t at which there is a risk of cracking occurring at the bend section is 0.5 to 3.0.
  • an upper limit of R/t is 2.0. If the metal plate has even higher ductility, the upper limit of R/t is 1.0.
  • the size of the bending radius R 1 of the bend section formed in the first step is defined in accordance with the conditions of the above Formulae (1) to (3) based on the aforementioned bending radius R 2 , and more preferably is defined in accordance with the conditions of the above Formulae (1), (4) and (5).
  • R 1 /R 2 is preferably less than 5.5, and more preferably is less than 3.5.
  • FIG. 3A and FIG. 3B are cross-sectional diagrams illustrating an example of the press-formed product according to the present embodiment.
  • FIG. 3A illustrates the entire press-formed product
  • FIG. 3B illustrates a bend section and the vicinity thereof.
  • a press-formed product 20 of the present embodiment is made from a metal plate having a tensile strength of 590 MPa or more.
  • the tensile strength may be 780 MPa or more, may be 980 MPa or more, and may be 1180 MPa or more.
  • a high strength steel plate is suitable as a metal plate having such tensile strength.
  • an aluminum plate, a titanium plate, a stainless steel plate, a magnesium plate and the like can also be used as the metal plate.
  • a high strength steel plate having a tensile strength of 1180 MPa or more is preferable as the metal plate.
  • the press-formed product 20 of the present embodiment has a hat-shaped cross-sectional shape, and includes a top plate part 21, two vertical wall parts 23a and 23b, two upper-side ridge line parts 22a and 22b, two flange parts 25a and 25b, and two lower-side ridge line parts 24a and 24b.
  • the upper-side ridge line parts 22a and 22b connect the top plate part 21 and the vertical wall parts 23a and 23b.
  • the lower-side ridge line parts 24a and 24b connect the vertical wall parts 23a and 23b and the flange parts 25a and 25b.
  • the press-formed product 20 is produced by a production method of the present embodiment that includes press working (bending) that is divided into two steps.
  • the top plate part 21 and the vertical wall part 23a constitute a pair of flat sections, and the upper-side ridge line part 22a connecting these flat sections constitutes a bend section 26.
  • the top plate part 21 and the vertical wall part 23b constitute a pair of flat sections, and the upper-side ridge line part 22b connecting these flat sections constitutes a bend section 27.
  • the vertical wall part 23a and the flange part 25a constitute a pair of flat sections, and the lower-side ridge line part 24a connecting these flat sections constitutes a bend section 28.
  • the vertical wall part 23b and the flange part 25b constitute a pair of flat sections, and the lower-side ridge line part 24b connecting these flat sections constitutes a bend section 29.
  • FIG. 3B the bend section 26 and the vicinity thereof in the press-formed product 20 of the present embodiment are representatively shown, with the contour thereof being indicated by a solid line.
  • the states of the other bend sections 27 to 29 and the vicinities thereof are similar to the state shown in FIG. 3B .
  • the contour of the bend section 5 of the press-formed product 2 that is obtained by the conventional bending method illustrated in the above described FIG. 1A is shown by a broken line
  • the contour of the bend section 8 of the press-formed product 7 that is obtained by the bending method of Patent Literature 1 illustrated in the above described FIG. 2A and FIG. 2B is shown by a chain double-dashed line.
  • the press-formed product 20 of the present embodiment has a characteristic plate thickness distribution at the bend section 26 and the vicinity thereof. Specifically, the plate thickness increases as the distance from the vicinity of a top part 26a of the bend section 26 increases. Further, as the distance from the vicinity of an end (a so-called "bend R end") 26b of the bend section 26 increases, the plate thickness decreases and thereafter increases again. In addition, beyond a position 26c that is separated by a distance corresponding to 1.5 times an original plate thickness to from the position of the end 26b of the bend section 26, the plate thickness becomes the original plate thickness to.
  • This plate thickness distribution is obtained by the production method of the present embodiment.
  • the plate thickness is reduced at flat sections (for example: the top plate part 21 and the vertical wall part 23a) around the bend section 26, and by this means a decrease in the plate thickness of the bend section 26 (for example: the upper-side ridge line part 22a) is suppressed.
  • a press-formed product with a hat-shaped cross section that has the above described plate thickness distribution is a member that is mounted in a vehicle, at a time that the member deforms due to a collision or the like, the upper-side ridge line parts 22a and 22b of the member bear the impact load.
  • the plate thickness of the upper-side ridge line parts 22a and 22b that are the bend section 26 is secured, the member is excellent in three-point bending characteristics and axial compressive deformation characteristics.
  • FIG. 4 is a view illustrating examples of a relation between a distance from a top part of a bend section and a plate thickness at a cross section of a press-formed product.
  • FIG. 5 is a view illustrating examples of a relation between a distance from a top part of a bend section and the surface layer strain at the bend section at a cross section of a press-formed product.
  • a circular mark indicates the press-formed product 20 obtained by the production method of the present embodiment (hereunder, also referred to as "Inventive Example of the present invention").
  • a triangular mark indicates the press-formed product 2 obtained by the conventional bending method illustrated in the above described FIG. 1A (hereunder, also referred to as "Comparative Example 1").
  • a square mark indicates the press-formed product 7 obtained by the bending method of Patent Literature 1 illustrated in the above described FIG. 2A and FIG. 2B (hereunder, also referred to as "Comparative Example 2").
  • FIG. 6 is a view illustrating, with respect to a cross section of a press-formed product, examples of a ratio "t 2 /1 1 " between an average value t 2 of the plate thickness at a flat section in a region extending from the position of an end of the bend section to a position separated therefrom by a distance corresponding to 1.5 times the original plate thickness, and a plate thickness t 1 of a top part of the bend section.
  • results with respect to the press-formed product 20 of the Inventive Example of the present invention, the press-formed product 2 of Comparative Example 1, and the press-formed product 7 of the Comparative Example 2 are shown side by side.
  • Comparative Example 1 and Comparative Example 2 the bending radius R 2 of the respective bend sections 26, 5 and 8 is 1.5 mm, and the exterior angle A 2 of the respective bend sections 26, 5 and 8 is 90°.
  • the bend section 5 of the press-formed product 2 of Comparative Example 1 was formed by press working that was performed in only one step.
  • the bend section 8 of the press-formed product 7 of Comparative Example 2 was formed by press working that was divided into two steps. Specifically, by press working in a first step, a bend section having a bending radius R 1 of 3 mm that is larger than the bending radius R 2 of the bend section 8 of the press-formed product 7 was formed, and by press working in a second step, the bend section 8 having a bending radius R 2 of 1.5 mm was formed. In other words, the bending radius ratio "R 1 /R 2 " was made 2.0. Further, the exterior angle A 1 of the bend section formed in the first step and the exterior angle A 2 of the bend section formed in the second step were made the same angle of 90°. In other words, an exterior angle ratio "A 1 /A 2 " was made 1.0. In short, the press-formed product 7 of Comparative Example 2 was formed according to conditions satisfied only the aforementioned Formulae (2) and (4) among the aforementioned Formulae (1) to (5).
  • the bend section 26 of the press-formed product 20 of the Inventive Example of the present invention was formed by press working that was divided into two steps. Specifically, by press working in a first step, a bend section having a bending radius R 1 of 3 mm that is larger than the bending radius R 2 of the bend section 26 of the press-formed product 20 was formed, and by press working in a second step, the bend section 26 having a bending radius R 2 of 1.5 mm was formed. In other words, the bending radius ratio "R 1 /R 2 " was made 2.0.
  • the bend section was formed to have an exterior angle A 1 of 120° that is larger than the exterior angle A 2 of the bend section 26 of the press-formed product 20, and by the press working in the second step, the bend section 26 was formed to have an exterior angle A 2 of 90°.
  • the exterior angle ratio " A 1 /A 2 " was made 1.33.
  • the press-formed product 20 of the Inventive Example of the present invention was formed according to conditions that satisfied all of the aforementioned Formulae (1) to (5).
  • the plate thickness at the top part 26a of the bend section 26 of the press-formed product 20 of the Inventive Example of the present invention is greater than the plate thickness at the top part of the bend section 8 in the press-formed product 7 of Comparative Example 1. Furthermore, a region in which the plate thickness decreases in a flat section at the periphery of the bend section 26 in the press-formed product 20 of the Inventive Example of the present invention is wider than a region in which the plate thickness decreases in a flat section at the periphery of the bend section 8 in the press-formed product 7 of Comparative Example 2.
  • the plate thickness ratio "t 2 /1 1 " for the press-formed product 20 of the Inventive Example of the present invention is less than 1.01, and is smaller than the plate thickness ratio "t 2 /1 1 " for the press-formed product 2 of Comparative Example 1 and for the press-formed product 7 of Comparative Example 2.
  • a decrease in the plate thickness of the top part 26a of the bend section 26 is suppressed.
  • the plate thickness ratio "t 2 /1 1 " for the press-formed product 20 is preferably less than 1.01, and more preferably is 1.00 or more and less than 1.01.
  • the bending radius of the bend section in the press-formed product of the present embodiment is, for example, a small value of 0 to 3 mm.
  • the press-formed product has the aforementioned plate thickness distribution. Therefore, the press-formed product is excellent in bending rigidity and torsional rigidity in a case where a static load is placed thereon. Further, in a case where an impact load is applied, buckling that takes the top part of the bend section as an origin is suppressed, and a high initial load and high impact energy absorption amount are obtained. Thus, the press-formed product is excellent in three-point bending characteristics and axial compressive deformation characteristics.
  • the press-formed product of the present embodiment is suitable, for example, as a frame member of an automobile body (for example, a cross member, a side member, a side sill and a pillar), and as various components of an automobile (for example, a door impact beam, a toe-control link and a suspension arm).
  • a frame member of an automobile body for example, a cross member, a side member, a side sill and a pillar
  • various components of an automobile for example, a door impact beam, a toe-control link and a suspension arm.
  • the upper-side ridge line parts 22a and 22b and the lower-side ridge line parts 24a and 24b that are bend sections each have the above described bending radii and plate thickness distribution.
  • a configuration may also be adopted in which any one of the upper-side ridge line parts 22a and 22b and the lower-side ridge line parts 24a and 24b has the above described bending radii and plate thickness distribution.
  • the press-formed product is not limited to the above described hat-shaped cross section.
  • the press-formed product may have a groove-shaped cross section that does not have flange parts.
  • the press-formed product having a groove-shaped cross section includes a top plate part, two vertical wall parts, and a ridge line part connecting the top plate part and each vertical wall part.
  • the top plate part and vertical wall parts constitute a pair of flat sections, and the ridge line part connecting these flat sections constitutes a bend section.
  • FIG. 7A to FIG. 7C are cross-sectional diagrams illustrating the basic concept of the production method for producing a press-formed product according to the present embodiment.
  • FIG. 7A illustrates a situation when performing processing in a first step
  • FIG. 7B illustrates a situation when performing processing in a second step
  • FIG. 7C illustrates a press-formed product 37 produced as a result of undergoing the processing illustrated in FIG. 7A and FIG. 7B .
  • FIG. 8A, FIG. 8B and FIG. 9A to FIG. 9C are cross-sectional diagrams that illustrate an overview of a production method of a first embodiment as a specific example.
  • FIG. 10A, FIG. 10B and FIG. 11A to FIG. 11C are cross-sectional diagrams that illustrate an overview of a production method of a second embodiment as a specific example.
  • FIG. 12A, FIG. 12B , FIG. 13A and FIG. 13B are cross-sectional diagrams that illustrate an overview of a production method of a third embodiment as a specific example.
  • FIG. 8A, FIG. 8B , FIG. 10A, FIG. 10B , FIG. 12A and FIG. 12B illustrate a situation when performing processing in a first step.
  • FIG. 8A, FIG. 8B and FIG. 9A to FIG. 9C are cross-sectional diagrams that illustrate an overview of a production method of a first embodiment as a specific example.
  • FIG. 8A , FIG. 10A and FIG. 12A illustrate a state prior to processing
  • FIG. 8B , FIG. 10B and FIG. 12B illustrate a state when processing is completed
  • FIG. 9A to FIG. 9C , FIG. 11A to FIG. 11C , FIG. 13A and FIG. 13B illustrate a situation when performing processing in a second step.
  • FIG. 9A , FIG. 11A and FIG. 13A illustrate a state prior to processing
  • FIG. 9B and FIG. 11B illustrate a state at an initial stage of processing
  • the FIG. 9C , FIG. 11C and FIG. 13B illustrate a state when processing is completed.
  • a dashed line in these drawings represents a center line.
  • the press-formed product is produced by press working that is divided into two steps.
  • the press-formed product 37 is produced by undergoing a first forming step as a first step and a second forming step as a second step in that order.
  • an intermediate formed product 36 is formed from a metal plate 35 that is the starting material by press working using a first press apparatus 30.
  • the press-formed product 37 is formed from the intermediate formed product 36 by press working using a second press apparatus 40.
  • the first press apparatus 30 and the second press apparatus 40 constitute a series of production equipment lines.
  • the first press apparatus 30 includes a first punch 31 and a first die 32 that are a pair.
  • the first and second embodiments that are illustrated in FIG. 8A, FIG. 8B , FIG. 10A and FIG. 10B include a die pad 38 and an inner pad (not illustrated in the drawings).
  • the die pad 38 is provided in the first die 32, and the inner pad is provided in the first punch 31.
  • the die pad 38 and the inner pad restrain and position the metal plate 35 at the time of press working in the first forming step.
  • a die pad and an inner pad need not be provided, as in case of the third embodiment that is illustrated in FIG. 12A and FIG. 12B .
  • the second press apparatus 40 includes a second punch 33 and a second die 34 that are a pair.
  • the first and second embodiments that are illustrated in FIG. 9A to FIG. 9C , and FIG. 11A to FIG. 11C include a die pad 39 and an inner pad (not illustrated in the drawings).
  • the die pad 39 is provided in the second die 34, and the inner pad is provided in the second punch 33.
  • the die pad 39 and the inner pad restrain and position the intermediate formed product 36 at the time of press working in the second forming step.
  • a die pad and an inner pad need not be provided, as in case of the third embodiment that is illustrated in FIG. 13A to FIG. 13B .
  • the second punch 33 of the second press apparatus 40 has a shoulder part 33a for forming a bend section 37c of the press-formed product 37.
  • An angle that a pair of faces that connect to the shoulder part 33a form is the same as the interior angle ⁇ 2 of the bend section 37c of the press-formed product 37.
  • the exterior angle of the angle of the shoulder part 33a is the same as the exterior angle A 2 of the bend section 37c of the press-formed product 37.
  • the radius of the shoulder part 33a is the same as the bending radius R 2 of the bend section 37c of the press-formed product 37.
  • the first punch 31 of the first press apparatus 30 has a shoulder part 31a for forming a bend section 36c of the intermediate formed product 36.
  • An angle that a pair of faces that connect to the shoulder part 31 a form is smaller than the interior angle ⁇ 2 of the bend section 37c of the press-formed product 37, and is the same as the interior angle ⁇ 1 of the bend section 36c of the intermediate formed product 36.
  • the exterior angle of the angle of the shoulder part 31a is greater than the exterior angle A 2 of the bend section 37c of the press-formed product 37, and is the same as the exterior angle A 1 of the bend section 36c of the intermediate formed product 36.
  • the radius of the shoulder part 31a is larger than the bending radius R 2 of the bend section 37c of the press-formed product 37, and is the same as the bending radius R 1 of the bend section 36c of the intermediate formed product 36.
  • the radius and angle (exterior angle) of the shoulder part 31a of the first punch 31, and the radius and angle (exterior angle) of the shoulder part 33a of the second punch 33 are set so that the bending radius R 1 and interior angle ⁇ 1 (exterior angle A 1 ) of the bend section 36c of the intermediate formed product 36 and the bending radius R 2 and the interior angle ⁇ 2 (exterior angle A 2 ) of the bend section 37c of the press-formed product 37 satisfy the conditions of the above described Formulae (1) to (3) or the above described Formulae (1), (4) and (5).
  • the press-formed product 37 is produced using the first press apparatus 30 and the second press apparatus 40 that are configured as described above.
  • the metal plate 35 that serves as a starting material is prepared in a starting material preparation step.
  • the metal plate 35 is a metal plate (for example, a high strength steel plate) that has a tensile strength of 590 MPa or more.
  • the first forming step as illustrated in FIG. 7A , FIG. 8A , FIG. 8B , FIG. 10A , FIG. 10B , FIG. 12A and FIG. 12B , press working is performed on the metal plate 35 using the first punch 31 and the first die 32, and depending on the case, also using the die pad 38 and the inner pad.
  • the bend section 36c is formed at a portion corresponding to the bend section 37c of the press-formed product 37 by the shoulder part 31a of the first punch 31 and the first die 32.
  • the intermediate formed product 36 is formed that has the bend section 36c in which the bending radius is R 1 and the interior angle is ⁇ 1 (exterior angle is A 1 ).
  • press working is performed on the intermediate formed product 36 using the second punch 33 and the second die 34, and depending on the case, also using the die pad 39 and the inner pad.
  • the bend section 37c is formed at a portion of the bend section 36c of the intermediate formed product 36 by the shoulder part 33a of the second punch 33 and the second die 34.
  • the press-formed product 37 is formed that has the bend section 37c in which the bending radius is R 2 and the interior angle is ⁇ 2 (exterior angle is A 2 ).
  • the press-formed product 37 illustrated in FIG. 7B , FIG. 9C , FIG. 11C and FIG. 13B is the press-formed product 20 having a hat-shaped cross section that is shown in FIG. 3A or is a press-formed product having a groove-shaped cross section.
  • the bend section 37c of the press-formed product 37 for example, is the upper-side ridge line parts 22a and 22b and the lower-side ridge line parts 24a and 24b of the press-formed product 20.
  • the flat sections 37a and 37b connecting to the bend section 37c of the press-formed product 37 are, for example, the top plate part 21, the vertical wall parts 23a and 23b, and the flange parts 25a and 25b of the press-formed product 20.
  • the plate thickness can be reduced at the flat sections 37a and 37b at the periphery of the bend section 37c, and a decrease in the plate thickness of the bend section 37c can be suppressed.
  • a decrease in the plate thickness of the bend section 37c can be suppressed.
  • FIG. 14 is a view that shows a relation between the exterior angle ratio " A 1 /A 2 " at the bend section and the surface layer strain at the bend section.
  • a circular mark indicates a case where production was performed according to the production method of the Inventive Example of the present invention
  • a triangular mark indicates a case where production was performed according to the production method of Comparative Example 1
  • a square mark indicates a case where production was performed according to the production method of Comparative Example 2.
  • the value of R/t for the press working in the first step was 2.14
  • the value of R/t for the press working in the second step was 1.07.
  • the value of R/t in the press working in the only one step was 1.07.
  • FIG. 15 is a view illustrating a relation between the perimeter ratio "L 1 /L 2 " of a bend section and the surface layer strain at the bend section.
  • a circular mark indicates a case where production was performed according to the production method of the Inventive Example of the present invention
  • a triangular mark indicates a case where production was performed according to the production method of Comparative Example 1
  • a square mark indicates a case where production was performed according to the production method of Comparative Example 2.
  • the bend section was formed by press working that was divided into two steps.
  • the bending radius R 1 was changed to various values within a range of values that were greater than the bending radius R 2 of the press-formed product while maintaining the exterior angle A 1 at the same angle as the exterior angle A 2 of the press-formed product.
  • the bend section was formed by press working that was divided into two steps.
  • the bending radius R 1 was changed to various values within a range of values that were greater than the bending radius R 2 of the press-formed product
  • the exterior angle A 1 was also changed to various values within a range of values that were greater than the exterior angle A 2 of the press-formed product.
  • FIG. 16 is a view illustrating a summary of the forming conditions according to the production method of the present embodiment.
  • the abscissa represents the bending radius ratio "R 1 /R 2 " of the bend section
  • the ordinate represents the perimeter ratio "L 1 /L 2 " of the bend section.
  • press-formed products Nos. 2, 4 and 6 were formed by the bending method disclosed in Patent Literature 1 that is illustrated in the above described FIG. 2A and FIG. 2B .
  • the value of R/t in the press working in the second step was made 1.07.
  • the value of R/t was made 1.42 for No. 2, 2.14 for No. 4, and 2.85 for No. 6.
  • press-formed products Nos. 3, 5 and 7 were formed by the production method of the present embodiment.
  • the value of R/t in the press working in the second step was made 1.07, similarly to Comparative Example 2.
  • the value of R/t was made 1.42 for No. 3 that is the same value as for No. 2 of Comparative Example 2
  • the value of R/t was made 2.14 for No. 5 that is the same value as for No. 4 of Comparative Example 2
  • the value of R/t was made 2.85 for No. 7 that is the same value as for No. 6 of Comparative Example 2.
  • the exterior angle ratio " A 1 /A 2 " was made 1.33.
  • the logarithmic strain in the bending direction (circumferential direction of cross section) in the outer surface at the top part of the bend section was determined for each of the press-formed products Nos. 1 to 7. The results are shown in FIG. 17 .
  • the surface layer strain in the Inventive Example of the present invention (Nos. 3, 5 and 7) was less than the surface layer strain in each of Comparative Example 1 (No.1) and Comparative Example 2 (Nos. 2, 4 and 6). It was thus clarified that according to the production method of the present embodiment, a press-formed product having a bend section with a smaller bending radius can be produced while suppressing cracking.
EP16742962.0A 2015-01-26 2016-01-25 Produit de formage ainsi que procédé et ligne de production pour la fabrication d'un tel produit de formage Active EP3251770B1 (fr)

Applications Claiming Priority (2)

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JP2015012269 2015-01-26
PCT/JP2016/000338 WO2016121358A1 (fr) 2015-01-26 2016-01-25 Article moulé par compression, et procédé et ligne d'équipement pour fabrication d'article moulé par compression

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JP5987934B2 (ja) * 2015-02-17 2016-09-07 Ｊｆｅスチール株式会社 プレス成形方法、プレス成形金型
JP7019970B2 (ja) * 2017-06-01 2022-02-16 日本製鉄株式会社 プレス成形品の製造方法、プレス装置、及びプレスライン
CA3083249C (fr) * 2017-11-21 2022-07-19 Honda Motor Co., Ltd. Procede de formage par presse
JP6870670B2 (ja) * 2018-09-13 2021-05-12 Ｊｆｅスチール株式会社 変形限界の評価方法、割れの予測方法及びプレス金型の設計方法

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JPS5610073B2 (fr) 1973-08-15 1981-03-05
JPH05317971A (ja) * 1992-05-18 1993-12-03 Matsushita Electric Works Ltd 曲げ加工方法
RU2057606C1 (ru) * 1992-10-20 1996-04-10 Челябинский государственный технический университет Способ изготовления профилей
JP3864899B2 (ja) 2002-12-05 2007-01-10 Ｊｆｅスチール株式会社 形状凍結性に優れたプレス加工方法およびそれに用いる加工工具
JP5429849B2 (ja) * 2009-01-28 2014-02-26 日新製鋼株式会社 鋼板の曲げ加工方法
CN101644921B (zh) * 2009-08-05 2011-07-20 无锡信捷电气有限公司 一种改进型板料数控折弯设计方法
JP2012115868A (ja) * 2010-11-30 2012-06-21 Jfe Steel Corp プレス板曲げ加工方法
JP5808940B2 (ja) * 2011-05-02 2015-11-10 本田技研工業株式会社 プレス成形方法及びその装置
WO2012161050A1 (fr) * 2011-05-20 2012-11-29 新日鐵住金株式会社 Procédé de moulage sous pression et composant de véhicule
CN103949544B (zh) * 2014-04-04 2016-05-04 华南理工大学 一种冲压件侧壁卷曲回弹控制冲压装置
CN103990672B (zh) * 2014-05-07 2016-04-20 云嘉集团有限公司 高强钢冷冲压成形回弹控制方法

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MX2017009583A (es) 2017-11-28
CN107206454B (zh) 2018-12-25
CN107206454A (zh) 2017-09-26
US20180009017A1 (en) 2018-01-11
EP3251770A4 (fr) 2018-09-12
CA2974625A1 (fr) 2016-08-04
US10807137B2 (en) 2020-10-20
WO2016121358A1 (fr) 2016-08-04
KR20170107063A (ko) 2017-09-22
CA2974625C (fr) 2018-12-11
RU2671028C1 (ru) 2018-10-29
EP3251770B1 (fr) 2020-01-01
JP6354864B2 (ja) 2018-07-11
BR112017014872A2 (pt) 2018-03-13
JPWO2016121358A1 (ja) 2017-11-16
KR101970423B1 (ko) 2019-04-18

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